The new £80 million Perth High School welcomed pupils for the first time on Thursday, 21 August.
Construction on the school began in February 2023 and was completed earlier this year.
Accommodating 1,600 pupils and 140 staff, the new building has been built on the former playing fields adjacent to the existing High School building, which will be demolished.
Staff began moving equipment into the school over the summer holidays and school staff have been working in the building over the summer to ensure it is ready for pupils today.
The new school was built by main contractor Robertson Construction Tayside on behalf of hub East Central Scotland and is designed to Passivhaus standards.
Learning and Families Committee Convener Councillor John Rebbeck said: "This is a fantastic new building that provides a far superior learning environment for our children and young people. The building has been designed and delivered to create a truly 21st Century Learning Environment.
"This is another public building that has been built to Passivhaus standards in Perth and Kinross. Buildings like Perth High School, Riverside Primary School and the new Blairgowrie Recreation Centre are far more energy efficient so their energy costs are much lower than normal buildings of comparative size.
"I am also delighted the new School will recognise the achievements of a previous well-respected convener of Lifelong Learning with the Bob Band Auditorium."
"I wish all the pupils and staff at the new school all the best for the year ahead and thank everyone who has helped bring this important project to fruition."
Elliot Robertson, Chief Executive Officer, Robertson Group, said: "It's been a great pleasure to work with Perth & Kinross Council once again. With the needs of pupils and their teachers always in mind, together we have created an inclusive environment where young people can learn, grow and reach their full potential. This high-quality building, the second we have delivered to Passivhaus standards for the Council, will also have very low energy consumption and running costs.
"We placed great importance on community wealth building during construction. This delivered a wide range of benefits including creating jobs and apprenticeships to engaging with a local supply chain and supporting community initiatives that will generate a long-lasting impact far beyond the project."
The school's official opening will take place later this year.